城际铁路大跨度连续梁桥减隔震分析
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摘要
由于城际铁路大跨度连续梁桥上部结构恒载较大,常规抗震设计难以满足规范要求。以西法(西安—法门寺)城际铁路(77+128+77) m大跨度连续梁桥为背景,采用摩擦摆减隔震支座和黏滞阻尼器相结合的减隔震措施,通过建立MIDAS/Civil有限元模型分析了城际铁路大跨度连续梁桥在高烈度区的减隔震性能。结果表明:所采取的措施可有效协同各墩共同承担地震响应,提高了结构的抗震性能;下部基础均处于弹性状态,墩梁之间的相对位移在合理范围内。
Because of the large dead load of the superstructure of the large span continuous girder bridge of intercity railway,the conventional seismic design is diff icult to meet the requirements of the code.Taking the(77+128+77) m large span continuous girder bridge of Xi'an-Famensi intercity railway as the background,the seismic isolation measures combining friction pendulum seismic isolation bearing and viscous damper were adopted.The seismic isolation performance of the large span continuous girder bridge of intercity railway in high-intensity region was analyzed by establishing MIDAS/Civil f inite element model.The results show that the measures can effectively cooperate with each pier to bear the seismic response and improve the seismic performance of the structure.The lower foundation is in an elastic state,and the relative displacement between pier and girder is controlled in a reasonable range.
Because of the large dead load of the superstructure of the large span continuous girder bridge of intercity railway,the conventional seismic design is diff icult to meet the requirements of the code.Taking the(77+128+77) m large span continuous girder bridge of Xi'an-Famensi intercity railway as the background,the seismic isolation measures combining friction pendulum seismic isolation bearing and viscous damper were adopted.The seismic isolation performance of the large span continuous girder bridge of intercity railway in high-intensity region was analyzed by establishing MIDAS/Civil f inite element model.The results show that the measures can effectively cooperate with each pier to bear the seismic response and improve the seismic performance of the structure.The lower foundation is in an elastic state,and the relative displacement between pier and girder is controlled in a reasonable range.
引文
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[2]叶爱君,管仲国.桥梁抗震[M].北京:人民交通出版社,2011.
[3]张鹏举.高烈度地震区长联大跨连续梁桥减隔震措施研究[J].铁道建筑,2017,57(5):10-12.
[4]崔鸣.大跨度连续梁黏滞阻尼器与双曲面球形减隔震支座的应用实例[J].铁道标准设计,2018,62(7):95-97.
[5]李健宁,虞庐松.液体粘滞阻尼器配合双曲面球形支座在大跨连续梁桥中的减隔震研究[J].兰州交通大学学报,2016,35(2):94-99.
[6]中华人民共和国建设部,中华人民共和国国家质量监督检验检疫总局.铁路工程抗震设计规范:GB 50111—2006[S].北京:中国计划出版社,2006.
[7]李侠.长联大跨连续梁桥减隔震设计方案比选[J].铁道建筑,2006,46(3):81-85.
[8]郭磊,李建中,范立础.大跨度连续梁桥减隔震设计研究[J].土木工程学报,2014,47(6):43-46.